"Charlie Smith" wrote in message
...
I have cobbled together a circuit from available internet sources to
illuminate a homebuilt aircraft instrument panel. I was wondering if
those qualified in this group would mind reviewing the schematic and
making constructive commentary.

Well, it looks like it'll work fine. If you care, you can gain some
efficiency by just using a IC meant for the task (regulating LED current)
directly -- these are really just a switching power supply controller IC
that's been tweaked to regulate current rather than voltage; you can do such
tweaking yourself if it's a cost sensitive design (using, e.g., an LT1070 or
one of its many variants). If you look at, e.g., Linear Tech's web site,
you'll find plenty of example circuits and application notes on this sort of
thing -- LED controllers are a Big Deal these days since of course pretty much
every cell phone, laptop, and TV needs one.

---Joel